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D( q )
q = 0
q = 0
q = 0
q in (-oo:0) U (0:+oo)
-35/q = -7 // + 7
7-35/q = 0
-35*q^-1 = -7 // : -35
q^-1 = 1/5
-1 < 0
1/(q^1) = 1/5 // * q^1
1 = 1/5*q^1 // : 1/5
5 = q^1
q = 5
q = 5
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